diff --git a/trunk/conf/full.conf b/trunk/conf/full.conf
index 7733f04585..81e98f1e2d 100644
--- a/trunk/conf/full.conf
+++ b/trunk/conf/full.conf
@@ -562,6 +562,12 @@ vhost rtc.vhost.srs.com {
         # Overwrite by env SRS_VHOST_RTC_KEEP_BFRAME for all vhosts.
         # default: off
         keep_bframe off;
+        # Whether keep the h.264 SEI type NALU packet.
+        # DJI drone M30T will send many SEI type NALU packet, while
+        # iOS hardware decoder (Video Toolbox) dislike to feed it
+        # so many SEI NALU between NonIDR and IDR NALU packets.
+        # @see https://github.com/ossrs/srs/issues/4052
+        keep_avc_nalu_sei on;
         # The transcode audio bitrate, for RTMP to RTC.
         # Overwrite by env SRS_VHOST_RTC_OPUS_BITRATE for all vhosts.
         # [8000, 320000]
diff --git a/trunk/conf/rtmp2rtc.conf b/trunk/conf/rtmp2rtc.conf
index daa50e2a74..efb070f655 100644
--- a/trunk/conf/rtmp2rtc.conf
+++ b/trunk/conf/rtmp2rtc.conf
@@ -31,6 +31,7 @@ vhost __defaultVhost__ {
         rtmp_to_rtc on;
         # @see https://ossrs.net/lts/zh-cn/docs/v4/doc/webrtc#rtc-to-rtmp
         rtc_to_rtmp on;
+        keep_avc_nalu_sei off;
     }
     http_remux {
         enabled     on;
diff --git a/trunk/src/app/srs_app_config.cpp b/trunk/src/app/srs_app_config.cpp
index b7efd889d9..00bd735951 100644
--- a/trunk/src/app/srs_app_config.cpp
+++ b/trunk/src/app/srs_app_config.cpp
@@ -2726,7 +2726,7 @@ srs_error_t SrsConfig::check_normal_config()
                         && m != "bframe" && m != "aac" && m != "stun_timeout" && m != "stun_strict_check"
                         && m != "dtls_role" && m != "dtls_version" && m != "drop_for_pt" && m != "rtc_to_rtmp"
                         && m != "pli_for_rtmp" && m != "rtmp_to_rtc" && m != "keep_bframe" && m != "opus_bitrate"
-                        && m != "aac_bitrate") {
+                        && m != "aac_bitrate" && m != "keep_avc_nalu_sei") {
                         return srs_error_new(ERROR_SYSTEM_CONFIG_INVALID, "illegal vhost.rtc.%s of %s", m.c_str(), vhost->arg0().c_str());
                     }
                 }
@@ -4474,6 +4474,26 @@ bool SrsConfig::get_rtc_keep_bframe(string vhost)
     return SRS_CONF_PERFER_FALSE(conf->arg0());
 }
 
+bool SrsConfig::get_rtc_keep_avc_nalu_sei(std::string vhost)
+{
+    SRS_OVERWRITE_BY_ENV_BOOL("srs.vhost.rtc.keep_avc_nalu_sei"); // SRS_VHOST_RTC_KEEP_AVC_NALU_SEI
+
+    static bool DEFAULT = true;
+
+    SrsConfDirective* conf = get_rtc(vhost);
+
+    if (!conf) {
+        return DEFAULT;
+    }
+
+    conf = conf->get("keep_avc_nalu_sei");
+    if (!conf || conf->arg0().empty()) {
+        return DEFAULT;
+    }
+
+    return SRS_CONF_PERFER_TRUE(conf->arg0());
+}
+
 bool SrsConfig::get_rtc_from_rtmp(string vhost)
 {
     SRS_OVERWRITE_BY_ENV_BOOL("srs.vhost.rtc.rtmp_to_rtc"); // SRS_VHOST_RTC_RTMP_TO_RTC
diff --git a/trunk/src/app/srs_app_config.hpp b/trunk/src/app/srs_app_config.hpp
index c6906e5fdf..afa700a0c8 100644
--- a/trunk/src/app/srs_app_config.hpp
+++ b/trunk/src/app/srs_app_config.hpp
@@ -533,6 +533,7 @@ class SrsConfig
     SrsConfDirective* get_rtc(std::string vhost);
     bool get_rtc_enabled(std::string vhost);
     bool get_rtc_keep_bframe(std::string vhost);
+    bool get_rtc_keep_avc_nalu_sei(std::string vhost);
     bool get_rtc_from_rtmp(std::string vhost);
     srs_utime_t get_rtc_stun_timeout(std::string vhost);
     bool get_rtc_stun_strict_check(std::string vhost);
diff --git a/trunk/src/app/srs_app_http_stream.cpp b/trunk/src/app/srs_app_http_stream.cpp
index 181ee14c09..e32472844c 100755
--- a/trunk/src/app/srs_app_http_stream.cpp
+++ b/trunk/src/app/srs_app_http_stream.cpp
@@ -855,6 +855,7 @@ srs_error_t SrsLiveStream::streaming_send_messages(ISrsBufferEncoder* enc, SrsSh
         if (msg->is_audio()) {
             err = enc->write_audio(msg->timestamp, msg->payload, msg->size);
         } else if (msg->is_video()) {
+            // TODO: drop h.264 NALU SEI here. @see https://github.com/ossrs/srs/issues/4052
             err = enc->write_video(msg->timestamp, msg->payload, msg->size);
         } else {
             err = enc->write_metadata(msg->timestamp, msg->payload, msg->size);
diff --git a/trunk/src/app/srs_app_rtc_source.cpp b/trunk/src/app/srs_app_rtc_source.cpp
index c74b59e9e4..e541d35f53 100644
--- a/trunk/src/app/srs_app_rtc_source.cpp
+++ b/trunk/src/app/srs_app_rtc_source.cpp
@@ -739,6 +739,7 @@ SrsRtcRtpBuilder::SrsRtcRtpBuilder(SrsFrameToRtcBridge* bridge, uint32_t assrc,
     codec_ = new SrsAudioTranscoder();
     latest_codec_ = SrsAudioCodecIdForbidden;
     keep_bframe = false;
+    keep_avc_nalu_sei = true;
     merge_nalus = false;
     meta = new SrsMetaCache();
     audio_sequence = 0;
@@ -771,8 +772,9 @@ srs_error_t SrsRtcRtpBuilder::initialize(SrsRequest* r)
     format->try_annexb_first = _srs_config->try_annexb_first(r->vhost);
 
     keep_bframe = _srs_config->get_rtc_keep_bframe(req->vhost);
+    keep_avc_nalu_sei = _srs_config->get_rtc_keep_avc_nalu_sei(req->vhost);
     merge_nalus = _srs_config->get_rtc_server_merge_nalus();
-    srs_trace("RTC bridge from RTMP, keep_bframe=%d, merge_nalus=%d", keep_bframe, merge_nalus);
+    srs_trace("RTC bridge from RTMP, keep_bframe=%d, keep_avc_nalu_sei=%d, merge_nalus=%d", keep_bframe, keep_avc_nalu_sei, merge_nalus);
 
     return err;
 }
@@ -1050,6 +1052,15 @@ srs_error_t SrsRtcRtpBuilder::filter(SrsSharedPtrMessage* msg, SrsFormat* format
     // Update samples to shared frame.
     for (int i = 0; i < format->video->nb_samples; ++i) {
         SrsSample* sample = &format->video->samples[i];
+        
+        if (!keep_avc_nalu_sei) {
+            if ((err = sample->parse_nalu_type()) != srs_success) {
+                return srs_error_wrap(err, "parse nalu_type");
+            }
+            if (sample->nalu_type == SrsAvcNaluTypeSEI) {
+                continue;
+            }
+        }
 
         // Because RTC does not support B-frame, so we will drop them.
         // TODO: Drop B-frame in better way, which not cause picture corruption.
diff --git a/trunk/src/app/srs_app_rtc_source.hpp b/trunk/src/app/srs_app_rtc_source.hpp
index 02e786cf28..75777a38f3 100644
--- a/trunk/src/app/srs_app_rtc_source.hpp
+++ b/trunk/src/app/srs_app_rtc_source.hpp
@@ -262,6 +262,7 @@ class SrsRtcRtpBuilder
     SrsAudioCodecId latest_codec_;
     SrsAudioTranscoder* codec_;
     bool keep_bframe;
+    bool keep_avc_nalu_sei;
     bool merge_nalus;
     uint16_t audio_sequence;
     uint16_t video_sequence;
diff --git a/trunk/src/kernel/srs_kernel_codec.cpp b/trunk/src/kernel/srs_kernel_codec.cpp
index 9afe07867e..d4fa6839e8 100644
--- a/trunk/src/kernel/srs_kernel_codec.cpp
+++ b/trunk/src/kernel/srs_kernel_codec.cpp
@@ -505,6 +505,7 @@ SrsSample::SrsSample()
     size = 0;
     bytes = NULL;
     bframe = false;
+    nalu_type = SrsAvcNaluTypeReserved;
 }
 
 SrsSample::SrsSample(char* b, int s)
@@ -512,6 +513,7 @@ SrsSample::SrsSample(char* b, int s)
     size = s;
     bytes = b;
     bframe = false;
+    nalu_type = SrsAvcNaluTypeReserved;
 }
 
 SrsSample::~SrsSample()
@@ -523,9 +525,9 @@ srs_error_t SrsSample::parse_bframe()
     srs_error_t err = srs_success;
 
     uint8_t header = bytes[0];
-    SrsAvcNaluType nal_type = (SrsAvcNaluType)(header & kNalTypeMask);
-
-    if (nal_type != SrsAvcNaluTypeNonIDR && nal_type != SrsAvcNaluTypeDataPartitionA && nal_type != SrsAvcNaluTypeIDR) {
+    nalu_type = (SrsAvcNaluType)(header & kNalTypeMask);
+    
+    if (nalu_type != SrsAvcNaluTypeNonIDR && nalu_type != SrsAvcNaluTypeDataPartitionA && nalu_type != SrsAvcNaluTypeIDR) {
         return err;
     }
 
@@ -549,18 +551,33 @@ srs_error_t SrsSample::parse_bframe()
 
     if (slice_type == SrsAvcSliceTypeB || slice_type == SrsAvcSliceTypeB1) {
         bframe = true;
-        srs_verbose("nal_type=%d, slice type=%d", nal_type, slice_type);
+        srs_verbose("nalu_type=%d, slice type=%d", nalu_type, slice_type);
     }
 
     return err;
 }
 
+srs_error_t SrsSample::parse_nalu_type()
+{
+    srs_error_t err = srs_success;
+
+    if (size < 1) {
+        return srs_error_new(ERROR_AVC_NALU_EMPTY, "empty nalu");
+    }
+    
+    uint8_t header = bytes[0];
+    nalu_type = (SrsAvcNaluType)(header & kNalTypeMask);
+    
+    return err;
+}
+
 SrsSample* SrsSample::copy()
 {
     SrsSample* p = new SrsSample();
     p->bytes = bytes;
     p->size = size;
     p->bframe = bframe;
+    p->nalu_type = nalu_type;
     return p;
 }
 
@@ -656,6 +673,7 @@ srs_error_t SrsFrame::add_sample(char* bytes, int size)
     sample->bytes = bytes;
     sample->size = size;
     sample->bframe = false;
+    sample->nalu_type = SrsAvcNaluTypeReserved;
     
     return err;
 }
diff --git a/trunk/src/kernel/srs_kernel_codec.hpp b/trunk/src/kernel/srs_kernel_codec.hpp
index 5f8fc934af..4467f2fa4a 100644
--- a/trunk/src/kernel/srs_kernel_codec.hpp
+++ b/trunk/src/kernel/srs_kernel_codec.hpp
@@ -1133,13 +1133,18 @@ class SrsSample
     char* bytes;
     // Whether is B frame.
     bool bframe;
+    // h.264 nalu type
+    SrsAvcNaluType nalu_type;
 public:
     SrsSample();
     SrsSample(char* b, int s);
     ~SrsSample();
 public:
     // If we need to know whether sample is bframe, we have to parse the NALU payload.
+    // TODO: FIXME: SrsSample can also be used as H.265(HEVC), the following two method
+    // need to be refactor to let SrsSample aware the format of NALU(avc or hevc).
     srs_error_t parse_bframe();
+    srs_error_t parse_nalu_type();
     // Copy sample, share the bytes pointer.
     SrsSample* copy();
 };
diff --git a/trunk/src/kernel/srs_kernel_error.hpp b/trunk/src/kernel/srs_kernel_error.hpp
index f24895b466..5c4f982d59 100644
--- a/trunk/src/kernel/srs_kernel_error.hpp
+++ b/trunk/src/kernel/srs_kernel_error.hpp
@@ -276,7 +276,8 @@
     XX(ERROR_HEVC_DISABLED                 , 3098, "HevcDisabled", "HEVC is disabled") \
     XX(ERROR_HEVC_DECODE_ERROR             , 3099, "HevcDecode", "HEVC decode av stream failed")  \
     XX(ERROR_MP4_HVCC_CHANGE               , 3100, "Mp4HvcCChange", "MP4 does not support video HvcC change") \
-    XX(ERROR_HEVC_API_NO_PREFIXED          , 3101, "HevcAnnexbPrefix", "No annexb prefix for HEVC decoder")
+    XX(ERROR_HEVC_API_NO_PREFIXED          , 3101, "HevcAnnexbPrefix", "No annexb prefix for HEVC decoder") \
+    XX(ERROR_AVC_NALU_EMPTY                , 3102, "AvcNalu", "AVC NALU is empty")
 
 /**************************************************/
 /* HTTP/StreamConverter protocol error. */